I know you said no pulleys but the 65mm or 62mm SC pulleys offer amazing increases in power. EC has a good sale going on for the pulley and tune right now. I am not familiar with the hardware you have. I have a cable that goes from the USBII port to my laptop and there I have several tunes stored which I can upload easily. The software, complete, offers datalogging and CEL clearing capabilities. You can give them a call and tell them what you have and see what they can do.
Question: How do you know you don't have the EC tune already installed?
The exhaust offers little in HP advances. I run 20-21psi of boost and removed the rear cats and resonator for a TRU internal X-pipe magnaflow muffler where the rear cats were, magnaflow "Y" leading to a 3" pipe and into a Borla muffler in the rear. I am hoping to have gained some power since I am running 50% more boost, thus 50% more exhaust to expel.